It looks like our friends over at Microsoft have outed a quartet of new Xbox Live games that will be delivered to the Windows Phone Marketplace in the not-too-distant future. Being billed as "optimized for the newest Windows Phone 7.5," the aforementioned -- and somewhat familiar -- titles include: Age of Zombies by Halfbrick, Bullet Asylum by UberGeekGames, geoDefense Swarm by Critical Thought, and Tamagotchi by Namco.

Why are these touchscreen-tickling titles familiar, you ask? Three of the four have been proving their mettle on other mobile platforms. GeoDefense Swarm and Tamagotchi are currently available in the iOS App Store; Age of Zombies is available in both the Android Market and iOS App Store; and Bullet Asylumhas been in the works for some time -- we were treated to a video preview last summer, which you'll find below. No word yet on release dates, but the foursome's mere presence on Microsoft's site makes us think that we won't have to wait all that long before initiating the download sequence.